Resilient suspension



Nov. 24, 1942. w. A; SCHRAK RESILIENT SUSPENSION Filed May 28, 1941INVENTOR Patented Nov. 24, 1942 UNITED STATES PATENT OFFICE RES ILIENTSUSPENSION William A. Schrak, East Orange, N. J., assignor to BendixAviation Corporation, South Bend, Ind., a corporation of DelawareApplication May 28, 1941, Serial No. 395,695

3 Claims. (o1. 248-358) This invention relates to suspensions, and moreparticularly to that type of suspension inwhich mechanical vibration isdamped.

An object of the present invention is the provision of a suspension inwhich the transmission of mechanical vibration from a base member to asuspended member is eliminated without the loss of mechanical strengthin the suspension.

It is another object of the invention to provide a shock-proofsuspending means for a mechanism wherein the resilience of thesuspension may be adjusted at will.

Other objects will appear from a study of the following specificationwhen made in conjunction with the attached drawing, throughout whichlike numerals designate like parts.

Fig. l is a plan view of one embodiment of the present invention,certain portions thereof being shown in section; and

Fig. 2 is a fragmentary elevational view, with a portion incross-section, the sectional plane being in the line 2-2 of Fig. 1. v

It is common to suspend a delicate unit, such as a radio receiver,voltage regulator, etc. in such a manner in aircraft, that the excessivemechanical' vibration caused by the engine, will be so damped that theunit suspended is comparatively free of vibration. A novel type ofvibration-proof suspension is shown in Figs. 1 and 2, wherein ldesignates one-half of a housing or base member which is ordinarilyrigidly attached to the body of the aircraft, and H represents a unitsuch as a voltage regulator, from which it is desired to eliminate themajor portion 01 the mechanical vibration existing in base member ll.For this reason, integral bosses l2 are cast Base member III has theusual terminal board ence in the suspension is provided by means oftubular members 20 and plugs i9, as all motion of base Hi can betransmitted to flange I6 only through the rubber or other flexiblematerial of members l9 and 20. Unit Il may be loosely coupled orsuspended from base ID by making the compression of plugs l9 9. minimum,that is, shanks I! may be retracted by means of a screw driver or othersuitable tool, so that lateral and longitudinal pressure between plug l9and sleeve 20, and between plug l9 and the bottom of recesses I5, is aminimum.

or molded into base member ID, and have internal screw threads i3,within the housing or base member ID. Integral cylindrical shoulderportions H are formed inwardly in screw threads l3, and directlyopposite each of the bosses l2, there is formed a recess I5 within theflange iii of the housing of voltage regulator ll. Pin members, havingcylindrical, rod-like shanks ll terminating in screw-threaded heads I8engaging with threads l3, project within recesses I5 to a point spacedfrom the bottom of recesses l5. Compressed between the shanks I1 and thebottom of the recesses, there are flexible plug members l9. Surroundingshanks l1, and snugly engaging the shanks, are tubular flexible members20 that extend from the bottom of recesses i5, through shoulders H ofbosses l2. Plugs l9 and flexible tubular members 20 may be formed orrubber or Further, unit I I may be more rigidly suspended by, or moretightly coupled to base I by advancing shanks I! further into recessesI5, causing greater compression laterally and longitudinally or plugsI9. I

The cylindrical shoulders l4, prevent tubular members 20 from bucklingor warping when shanks I! are advanced into recesses i5 and when thrustsare imparted to members 20 by lateral motion of unit ll. These shouldersalso act to hold members 20in proper alignment regardless oi the axialposition of screw-threaded heads 18 in bosses I2.

It will be seen that the weight of regulator II i carried by shanks I!through a cushion of rubber provided by members 20. Shanks I! may be ofmaterial such as aluminum, brass or steel,

to support the mass of unit H without overload, and to transmit the loadto housing ID. The great tensile strength of rubber or Neoprene incompression is thus utilized in order to provide a shock-proof mounting,with varying degrees of damping under the control 01' the operatorinstalling the unit.

While only one embodiment of the present invention has been shown in thedrawing, it is to be understood that various changes may be made withoutdeparting from the scope of the present invention. For this reason, itis intended not a rubber substitute, such as Neoprene or the like. tolimit the invention by the description herein given as an example, butsolely by the scope of the appended claims.

I claim:

1. A vibration absorbing unit comprising in combination, a supportingbase, a mechanism to;

be resiliently supported, a-plurality of spaced, internally threadedmembers carried by said supporting base, a rod-like member having athreaded head in engagement with each of said members, a recessedportion in said mechanism opposite each of said threaded members, aflexible, tubular member extending. into each of said recesses and overeach of said rod-like members, and a plug of flexible, deformablematerial with.- in each or said recesses, said plugs being laterallyexpanded into tight engagement with said tubular members.

2. A resilient suspension comprising in com-- bination, a pin having acylindrical shank and a head for engagement, with a suitable base, amechanism to be suspended having a housing, a cylindrical recess in saidhousing, a tubular,

boss and into said recess and being or such externai diameter that itfits snugly within said recess and said circular aperture, the diameterof said shank and the internal diameter of said member being so relatedthat said tubular member snugly fits over said shank, and a plug ofresilient material within said recess and under compression by said pin.

WILLIAM A. SCHRAK.

